#app {
  width: 100%;
  height: 100vh;
}

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

/* 明确重置标题元素，覆盖 normalize.css 的默认样式 */
h1,
h2,
h3,
h4,
h5,
h6 {
  padding: 0;
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

a {
  color: inherit;
  text-decoration: inherit;
}
